dear thilo thanks for your nice comment u made me think about that pic from anther view :) & plz feel very free if u have any critique " it's what makes photos better, would love to keep intouch with u
the composition is good with the strong silhoettes and the back lighting as a cherry on top of that. Personally, I would exclude some of the details here, especially the part on the right. you may think about the detail on the left side - I personally would delete at least the triangle that points out of the picture.
to bring it to the point: If you wish to compose silhouettes with back lighting, then the silhouettes itself should create a lot of tension as you virtually don't have any other distinguishing factors like color, sharpness/blur, DOF, color gradients and so on. just my thoughts though ;-)
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